Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c518633b1782e96…

MALICIOUS

PDF

40.9 KB Created: 2020-09-20 06:40:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a31c583ece2db7797c256fce556e7c0 SHA-1: d51cb15fcdf1659edc63fef80b6dc3ff66cfed0d SHA-256: 1c518633b1782e96e8e2437415b2f01767f20d47103f4a10fc5b5f25bb19abb5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious due to a high ML classifier score and critical heuristic firings indicating it is a redirector link and a link farm. The document body contains numerous embedded URLs, including a suspicious redirector URL: https://ttraff.link/wix?keyword=administrative+information+systems+%2528ais%2529. The presence of a link farm suggests an attempt to distribute malicious content or phish users by directing them to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.link/wix?keyword=administrative+information+systems+%2528ais%2529
    • http://timomipo.rosannebane.com/uploads/1/3/2/7/132741009/5d424870489c.pdf
    • http://files.joshlewisjournalism.ca/uploads/1/3/2/7/132740435/rusonorekuze-wijewago-fotajovorud-pezukosixa.pdf
    • http://files.pagesinmypassport.com/uploads/1/3/1/6/131637679/5940590.pdf
    • http://files.linmog.co.uk/uploads/1/3/2/6/132681325/5242385.pdf
    • http://losuveve.thundapaw.com/uploads/1/3/0/7/130776180/tikonis.pdf
    • https://4e350dfe-8f07-4743-978b-a32cb38836c6.filesusr.com/ugd/97634b_6b17a1b4a74c473e9389c8c4cca37263.pdf?index=true
    • https://a13f8e38-6ef6-4502-b35d-d36768952f79.filesusr.com/ugd/b16523_09a32b896a8b42dcbeafb8079df1a9cd.pdf?index=true
    • https://29c5cf41-335e-4771-b821-6bb1040156d6.filesusr.com/ugd/d01287_42b8727555184a99a1fce29a808808ec.pdf?index=true
    • https://fa345333-678f-41e1-9837-32e28ee0ce5d.filesusr.com/ugd/e3ff21_26cf506fcb9240c6adfff89c2acb83a9.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/faxekuxi.pdf
    • https://cdn.shopify.com/s/files/1/0479/6255/4535/files/mt_dew_nation_rewards.pdf
    • https://cdn.shopify.com/s/files/1/0437/2935/4917/files/duwazuxiweg.pdf
    • https://cdn.shopify.com/s/files/1/0444/4022/3911/files/multiplying_integers_worksheet_grade_6.pdf
    • https://e1f4a122-f2be-41d2-83b0-1c7ea7c8bd86.filesusr.com/ugd/3e5db3_2c8755981552499aa15c23a18708d0a4.pdf?index=true
    • https://efc9616c-4b07-4e9d-ab6f-cb6bd3c6fb98.filesusr.com/ugd/3cb679_8da1d3058b4e4445b62c529ffe3735ad.pdf?index=true
    • https://a6d22f70-c99c-4244-a887-6e0f6d9963f6.filesusr.com/ugd/ed2d23_7b083da3bb104504a40de58597477285.pdf?index=true
    • https://8d396d85-0a27-4b00-8fb4-1dd44a6238f6.filesusr.com/ugd/bc79a4_15ded62049bc4e62a31788315692d06a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006201.bin
a867db18c944b233dcb855b8bf65e9f56494e63476a31c4210f6184336a808ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6201 5328 bytes
font_01_sfnt_off00007422.bin
7cfe8a3d1f09c687d447040709b374c9acc262c74ed546a0d167e52cbe5e4f99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7422 10120 bytes

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